Georg Fischer Aktiengesellschaft

Bruno Hilpert

Bruno Hunziker

Herbert Kramer

Kaspar Davatz

Device for welding tubular components of plastics material

A heating arrangement (2) embracing tubular parts (1a, 1b) of plastic material which have to be joined by welding, comprises electrically heatable jaws (26). A bladder (50) expandable by compressed air is arranged inside the tubular parts (1a, b), which includes a centrally arranged tensile part (56) such as, for instance, cable for the purpose of limiting the length. The air pressure in the bladder is higher than the pressure generated by the material when melting, this for the purpose of producing an adequate welding pressure.

Method and apparatus for joining tubular plastic parts by welding

A shut-off valve assembly includes a housing which has a spherical plug arranged in a chamber. The housing has an internal thread into which a support element for a sealing member is screwed. On the outer end face of the support element is supported a flange bushing by means of a retaining nut. The pitches of the internal thread and of an external thread for the retaining nut are directed in opposite directions, so that the support element cannot be loosened when the retaining nut is unscrewed.

Shut-off valve with spherical plug

An actuating device operated by a pressure medium, such as compressed air, acting within a housing, can be secured to a valve by a mounting member attached to the valve. The actuating device includes a first piston guided in a cylinder part positioned on one side of the center part of the housing. A toothed rack is attached to the first piston and is in meshed engagement with a pinion shaft located within the center part of the housing. The pinion shaft is connected by a coupling part to the valve shaft. The same actuating device can be used for a larger valve by placing a second piston in another cylinder part on the opposite side of the center part from the first piston with a toothed rack attached to the second piston and in meshed engagement with the pinion shaft. The first and second pistons act in opposite directions and double the torque acting on the pinion shaft as compared to the torque delivered by the first piston.

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Diessenhofen, Switzerland

Bruno Hilpert